Chances of HIV Positive I had one unprotected encounter with a sex worker I did following tests for HIV HIV Antibody Test at 21 Days Negative HIV Antibody Test at 2 months Negative CMIA Method at 12 weeks Negative Rapid Test at 3 months Negative CMIA test at 20 weeks (4.5 months) Negative CMIA Test at 22 Weeks Negative too COMBO Test Negative at 24 week too RNA PCR and Combo Test Negative at 24 weeks 5 days too Elisa Test at 25 weeks Negative too Negative Hepatitis B, C and VDRL too is it conclusive.